extends Node

# Change SERVER_URL to your server address before deploying.
# Set the same HMAC_SECRET on the server via env var SPACEL_SECRET.
const SERVER_URL  := "https://lb.alpacaman.de"
const HMAC_SECRET := "63f4945d921d599f27ae4fdf5bada3f1"

signal scores_fetched(scores: Array, error: String)
signal submit_done(ok: bool)

var _http: HTTPRequest
var _mode: String = ""

func _ready() -> void:
	_http = HTTPRequest.new()
	add_child(_http)
	_http.request_completed.connect(_on_completed)

func fetch_scores() -> void:
	if _mode != "":
		return
	_mode = "fetch"
	_http.request(SERVER_URL + "/scores")

func submit_score(player_name: String, score: int, wave: int) -> void:
	if _mode != "":
		return
	var ts := int(Time.get_unix_time_from_system())
	var raw := player_name + str(score) + str(wave) + str(ts)
	var hmac := Crypto.new().hmac_digest(
		HashingContext.HASH_SHA256,
		HMAC_SECRET.to_utf8_buffer(),
		raw.to_utf8_buffer()
	).hex_encode()
	var body := JSON.stringify({
		"name":      player_name,
		"score":     score,
		"wave":      wave,
		"timestamp": ts,
		"hmac":      hmac
	})
	_mode = "submit"
	_http.request(
		SERVER_URL + "/scores",
		PackedStringArray(["Content-Type: application/json"]),
		HTTPClient.METHOD_POST,
		body
	)

func _on_completed(result: int, code: int, _headers: PackedStringArray, body: PackedByteArray) -> void:
	var ok := result == HTTPRequest.RESULT_SUCCESS and code == 200
	if _mode == "fetch":
		if ok:
			var json := JSON.new()
			if json.parse(body.get_string_from_utf8()) == OK:
				var data = json.get_data()
				if data is Array:
					scores_fetched.emit(data as Array, "")
					_mode = ""
					return
		scores_fetched.emit([], "lb_error")
	elif _mode == "submit":
		submit_done.emit(ok)
	_mode = ""